DIY relocation of radiator - which pipes? pex / copper/ what else.. too many choices!

[boolie]

this is becoming a can of worms.. old houses don't you just love them?? the floorboards are in a bad state and are 22mm thickness, thought I'd replace the section that I cut out with new ones- can't find the same thickness anywhere!
https://www.diynot.com/diy/threads/22-mm-thickness-floorboards-old-house.567045/

 

[Madrab]

There's loads of suppliers that have 22mm T+G spruce/pine floor boards, just do a search.

All else fails then buy some reclaimed.